java :erreur de compilation Fermé

Question

Bonjour, 
j'ai une erreur lors de compilation,veuillez aidez moi svp

abstract public class Figure 
{
 int x,y;
 void changePosition (int newX,int newY)
 { }
 abstract void draw();
 {}
}

public class CirculeObject extends Figure
{
  void draw()
  {
	  System.out.println("Draw method called");
  }
}

public class RectangleObject extends Figure 
{
 void changePosition(int newX,int newY)
 {
	 System.out.println("change position method called");
 }
 public static void main(String[]args)
 {
	FigureObject f0=new FigureObject(20,15);
	f0.draw();
	CirculeObject f1=new CirculeObject();
	f1.draw();
    RectangleObject f2=new RectangleObject() ;
	f2.changePosition(10,20);
 }
}


Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	FigureObject cannot be resolved to a type
	FigureObject cannot be resolved to a type

	at RectangleObject.main(RectangleObject.java:10)

Configuration: Windows 7 / Firefox 11.0

KX · Answer

Si draw est abstraite dans Figure alors :
1) Tu ne dois pas mettre d'accolades derrière.
2) Tu dois définir la méthode draw dans RectangleObject sinon elle sera également abstraite et tu ne pourra pas faire d'instanciation (new RectangleObject)

domxaline · Answer

vous voulez que je fasse comme ça

abstract public class Figure 
{
 int x,y;
 void changePosition (int new x,int new y)
 {
	 
 }
 abstract void draw();
}

public class RectangleObject extends Figure 
{
    //void changePosition(int newX,int newY)
	void draw(int newX,int newY)
 {
	 System.out.println("change position method called");
 }
 public static void main(String[]args)
 {
	FigureObject f0=new FigureObject(20,15);
	f0.draw();
	CirculeObject f1=new CirculeObject();
	f1.draw();
    RectangleObject f2=new RectangleObject() ;
	f2.changePosition(10,20);
 }
}

j'ai toujours la même erreur
Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	FigureObject cannot be resolved to a type
	FigureObject cannot be resolved to a type
	The method changePosition() in the type Figure is not applicable for the arguments (int, int)

	at RectangleObject.main(RectangleObject.java:11)

domxaline · Answer

abstract public class Figure 
{
 int x,y;
 void changePosition (int new x,int new y)
 {
	 
 }
 abstract void draw();

}

domxaline · Answer

le correction
public class RectangleObject extends Figure 
{
    void changePosition(int newX,int newY)
	void draw(int newX,int newY)
 {
	 System.out.println("change position method called");
 }
 public static void main(String[]args)
 {
	Figure f0=new Figure(20,15);
	f0.draw();
	CirculeObject f1=new CirculeObject();
	f1.draw();
    RectangleObject f2=new RectangleObject() ;
	f2.changePosition(10,20);
 }
}

nini · Answer

en générale la sous classe devient abstraite l'orque elle contient une méthode abstraite au fait je vous demande est ce qu'il y a d'autre cas dans le qu'elle la  sous classe sois abstraite

domxaline · Answer

abstract public class Figure 
{
 int x,y;
 
 void changePosition (int x,int y)
 {
	 
 }
  abstract void draw()
}


public abstract class CirculeObject extends Figure
{
  void draw()
  {
	  System.out.println("Draw method called");
  }
}


public abstract class RectangleObject extends Figure 
{
    void changePosition(int newX,int newY)
	void draw(int newX,int newY)
 {
	 System.out.println("change position method called");
 }
 public static void main(String[]args)
 {
	Figure f0=new Figure(20,15);
	f0.changePosition();
	CirculeObject f1=new CirculeObject();
	f1.draw();
    RectangleObject f2=new RectangleObject() ;
	f2.changePosition(10,20);
 }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	Cannot instantiate the type Figure
	The method changePosition(int, int) in the type Figure is not applicable for the arguments ()
	Cannot instantiate the type CirculeObject
	Cannot instantiate the type RectangleObject

	at RectangleObject.main(RectangleObject.java:11)

domxaline · Answer

public abstract class RectangleObject extends Figure 
{
    void changePosition(int newX,int newY)
	void draw(int newX,int newY)
 {
	 System.out.println("change position method called");
 }
 public static void main(String[]args)
 {
	Figure f0=new Figure();
	f0.changePosition(20,15);
	CirculeObject f1=new CirculeObject();
	f1.draw();
    RectangleObject f2=new RectangleObject() ;
	f2.changePosition(10,20);
 }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	Cannot instantiate the type Figure
	Cannot instantiate the type CirculeObject
	Cannot instantiate the type RectangleObject

	at RectangleObject.main(RectangleObject.java:11)

domxaline · Answer

bonjour j'ai corrigé mon prg ainsi mais toujous j'ai une erreur

abstract public class Figure 
{
 int x,y;
 
 void changePosition (int newX,int newY)
 {
	 
 }
 abstract void draw();
}



public abstract class CirculeObject extends Figure
 {
  void draw()
  {
	  System.out.println("Draw method called");
  }
 }



public abstract class RectangleObject extends Figure 
{
    void changePosition(int newX,int newY)
	
     {
	    System.out.println("change position method called");
     }	
 }



public class AbstractEssaie 
{
	public static void main(String[]args)
	 {
		CirculeObject c=new CirculeObject();
		Figure figuref;
		figuref=c;
		System.out.println("CirculeObject is"+figuref.changePosition(newX,newY));
		
		RectangleObject r =new RectangleObject();
		figuref=r;
		System.out.println("RectangleObject is"+figuref.draw(x,y));
		
     }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	Cannot instantiate the type CirculeObject
	newX cannot be resolved to a variable
	newY cannot be resolved to a variable
	Cannot instantiate the type RectangleObject
	x cannot be resolved to a variable
	y cannot be resolved to a variable

	at AbstractEssaie.main(AbstractEssaie.java:6)

Java :erreur de compilation

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